Last name: Riley. Tweet. This famous surname can be either English or Irish. It is found in both countries in several and overlapping spellings including Riley, Ryley, Reily, Reely and Reilly, as well as the pure Gaelic McReilly, O'Reilly and O'Ralilly.
Best Answer: A service level agreement (frequently abbreviated as SLA) is a part of a service contract where the level of service is formally defined. In practice, the term SLA is sometimes used to refer to the contracted delivery time (of the service) or performance. Source(s): rookethorne Â· 8 years ago.
Service Level Agreements (SLA) A service level agreement often called an SLA for short, is an agreement between a supplier and customer that specifies specific service levels. This agreement can be either formal, a negotiated contract between two companies, or informal, like an understanding between two departments in a company.